<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>何为数据代理</title>
    <script src="../js/vue.js"></script>
</head>
<body>
    <script>
        let obj1 = {x:100}
        let obj2 = {y:200}

        Object.defineProperty(obj2,'x',{
            get() {
                return obj1.x;
            },
            set(v) {
                obj1.x = v;
            }
        })
    </script>
</body>
</html>